Vulcanized rubber



UNITED STATES PATENT OFFICE.

CHARLES-R. noses, OE ARLINGTON HEIGHTS, MASSACHUSETTS, 'ASSIGNOR To SIMPLEX WIRE AND CABLE COMPANY, A CORPORATION OF MASSACHU- Specification of "Letters Patent. Patent d B 28 1920 SETTS. VULCANIZED RUBBER.

No Drawing.

explained in said patent, wherein my novel process of vulcanizing with selenium or its compounds, is described and claimed, I have discovered that an improved vulcanized rub"- ber product is Obtained by the employment of selenium 'or' any of the selenium compounds, as a vulcanizing agent, preferably utilizing an artificial accelerator, as explained in said prior application. In manu facturing my improved product, rubber, re-

' or its compounds,

ization,

claimed or regenerated rubber, or wild caout'chouc, aswell as synthetic rubber, may be used, and I prefer to employ selenium, in the form of-a powder, mixing the same. with the rubber and with an accelerator. Heretofore it has been customary to depend on sulfur or its compounds as an essential element inv vulcanand therefore my discovery of a practical method of vulcanization with selenium or its compounds results in a new article of manufacture. In carrying out my invention I may use any of the selenium compounds, selenids, poly-selenids, or the like, with good results. Also a mixture of any of these be employed with sulfur compounds in carrying out my invention. My inventionis equally capable of use in the production of either hard or soft vulcanized rubber, this being controlled entirely according to the amount of selenium used-and the time and temperature employed, procuring a greatly improved qualpounds to vulcanize rubber,

dition of an artificial accelerator, I prefer to ity of product, the physical tests and the enduring qualities of the resulting rubber article being all materially-increased.

While I may employ selenium or its comwithout the addred and thirty parts of zinc such for exampleas its chlorids,

Application filed. September 11, 1917. Serial NO. 19o,73'2.

is explained in In said patent,such accelerator consistingo the primary or secondary amins of the aliphatic or aromatic series or other ring structure.

In practice, I find that the following formulee have proved to be especially practicable and commercially satisfactory, and are herein glven for the purpose of illustration,

it being understood that a wide variation from these examples is within the scope of my invention. For example, one hundred parts Hevea rubber, fourteen parts selenium one part para nitroso di methyl anilin,

twenty-'five parts litharge, and one hundred seventy five parts of Whiting and zinc oxid. T hlS mixture, when heated at 275 degrees F.

' for an-hour, gives a very satisfactory improved vulcanized rubber product, especially successful in making a soft vulcanized product.

Another example is the following: One hundred parts of Hevea rubber are mixed with twenty-eight parts of selenium, four parts beta-naphthylamin, twenty-five parts litharge, four parts paraffin, oxid and whitmg in suitable'proportions, and heated at 320 degreesF. for four hours. The time can be materiallyreduced with increase in temperature, and any filler may be employed; for example, I find that a suitable proporand one hun.

tion for the wh ting and zinc oxid is 80 parts of whiting to 50 parts of zinc oxid, constituting a total of 130 parts, but as both these materials are inert agents, these proportions may be, of course, widely varied.

. As above explained, the variation in the amount of selenium, used and the time and temperature of the heat applied for vulcanization will control the production of either hard or soft vulcanized rubber, as willbe readily understood by those skilled in the art.

The resulting product is a new article of manufacture, and being a direct production of my selenium process, I wish to claim the same herein.

My invention is further described and defined in the form of claims as follows:

1. As anew article of manufacture, vulcanized rubber consisting, before vulcanization, of a mixture of rubber, inert matter, selenium, and an accelerator of the amins of the aromatic series.

2. As a new article of manufacture, vulv canized rubber consisting before vulcaniza- In testimony whereof; I have signed my tion, of one hundred parts of rubber mixed name to this specification, in thepresence of with twenty-eight parts of selenium, 'four two subscribing witnesses.)

parts beta-napht hylamin, twenty-five parts CHARLES R. BOGGS; litharge, four parts parafiin, and one hun- Witnesses:

ired and thirty parts of zinc oxid. and whit- AGNES B. GRIFFIN,

SEBASTIAN 'RUGGERI. 

